Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first image of a sequence of the displayscreen or portion thereof with transitional graphical user interfaceaccording to the claimed design; and,

FIG. 2 is a front view of a second image of a sequence according to theclaimed design.

The thick, dashed hexagon in FIGS. 1 and 2 portrays an environment andforms no part of the claimed design.

The gradient background of the graphical user interface is claimedsubject matter.

The longer length broken line showing of a display screen and theintermediate length broken line showing of a display screen boundary,are included for the purpose of illustrating environmental structure.The dash-dot-dash broken line showing represents an artificial boundarywhich divides the screen into two regions and forms no part of theclaimed design.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-2. The process or period in whichone image transitions to another forms no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.